#include<iostream>
#include<vector>
#include<queue>
#include<cstring>
#include<cmath>
#include<map>
#include<set>
#include<cstdio>
#include<algorithm>
#define debug(a) cout<<#a<<"="<<a<<endl;
using namespace std;
const int maxn=2e5+1000;
typedef long long LL;
inline LL read(){LL x=0,f=1;char ch=getchar();	while (!isdigit(ch)){if (ch=='-') f=-1;ch=getchar();}while (isdigit(ch)){x=x*10+ch-48;ch=getchar();}
return x*f;}
int countQuadruplets(vector<int>& nums) {
    int n=nums.size();
    int ans=0;
    for(int i=0;i<n;i++)
    {
        for(int j=i+1;j<n;j++)
        {
            for(int k=j+1;k<n;k++)
            {
                for(int p=k+1;p<n;p++)
                {
                    if(nums[i]+nums[j]+nums[k]==nums[p])
                    {
                        ans++;
                    }
                }
            }
        }
    }
    return ans;
}
int main(void){


   	return 0;
}
